When running these examples, `node` fails to return as this
`MessagePort` keeps the event loop active in the main thread unless
it is `unref()`ed.
Fixes: https://github.com/nodejs/node/issues/52846
PR-URL: https://github.com/nodejs/node/pull/53637
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
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